Fidelity estimator, randomized benchmarking and ZNE for quantum pulses
- URL: http://arxiv.org/abs/2305.12597v1
- Date: Sun, 21 May 2023 23:12:20 GMT
- Title: Fidelity estimator, randomized benchmarking and ZNE for quantum pulses
- Authors: Jinglei Cheng, Zhiding Liang, Rui Yang, Hang Ren, Yiyu Shi, Tongyang
Li, Xuehai Qian
- Abstract summary: Most previous research focused on designing pulse programs without considering the performance of individual elements or the final fidelity.
We use reversed pulses to evaluate the performance of quantum pulses, which can provide guidance to design pulse programs.
- Score: 23.13502651749199
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Most previous research focused on designing pulse programs without
considering the performance of individual elements or the final fidelity. To
evaluate the performance of quantum pulses, it is required to know the
noiseless results of the pulses. However, quantum pulses can implement unitary
matrices that are not analytically known to the user, and pulse simulator
usually comes with significant computational overhead. Consequently,
determining fidelity of a pulse program is challenging without the knowledge of
the ideal results. In this paper, we propose to use reversed pulses to evaluate
the performance of quantum pulses, which can provide guidance to design pulse
programs. By employing reversed pulses, we can ensure that, in the noiseless
situation, the final quantum states are the same as the initial states. This
method enables us to evaluate the fidelity of pulse programs by measuring the
difference between the final states and the initial states. Such fidelity
estimator can tell whether the results are meaningful for quantum pulses on
real quantum machines. There are various quantum error correction (QEC) methods
available for gate circuits; however, few studies have demonstrated QEC on
pulse-level programs. In this paper, we use reversed pulses to implement zero
noise extrapolation (ZNE) on pulse programs and demonstrate results for
variational quantum eigensolver (VQE) tasks. The deviation from the idea energy
value is reduced by an average of 54.1\% with our techniques.
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